Предмет: Химия, автор: Mshumilkina

Определите количество вещества азота, которые заключается в 70 грамм этого газа. Сколько молекул содержится в этой массе азота ?

Ответы

Автор ответа: DiMEDIAN

Азот N₂
Мол. масса=28
Кол-во вещества =2,5 моль
Кол-во молекул= 15,05 · 10²³

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Fictional character Pavel Andreievich Chekhov first appeared on TV in 1967, during the second season of the science fiction series Star Trek. Despite being on TV for a short time (from 1966-69), the series was a hit and still has many fans today, 40 years after its creation. Star Trek led to ten feature films, an animated series, novels and comic books. So why was it so popular and why did they need a Russian star?
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We can view the character of Chekhov as symbolic, one introduced to present a better world. Created in the 1960s during the Cold War, the series was set in a very different time - in the 230 century. There was a rumour that the Russians themselves came up with the idea of including a Russian character, writing an article in Pravda criticising the absence of a Russian in the series. One thing is sure - it made sense to have a Russian on board as the Soviet Union was one of the leaders in space exploration. Other characters of the multinational crew included Scotty (of Scottish heritage), Sulu (from Japan), Uhura (from Africa) and Spock, the half-human, part alien (Vulcan). All were on the same mission: 'to explore new worlds, to seek out new life and new civilisations, to boldly go where no man has gone before', as the series states in its opening.
Chekhov and the crew certainly live through many exciting adventures: mysterious illnesses, capture by aliens, time travel -even romance. In the course of the two series we get to know Chekhov quite well. We see that he has many positive qualities: he is young, good-looking and has a good sense of humour. He regularly jokes (and boasts) about Russia's achievements. He even claims in one programme that the fairy tale Cinderella came from Russia! However, he himself was less lucky in love. While training at the Academy in the 2260s Chekhov had a romance with another Russian, Irina Galliulin. But their characters were too different (Irina criticised Chekhov for being too rigid) and disappointment followed.
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